ALTER INDEX REBUILD drops statistics ...
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  1. #1
    Join Date
    Apr 2002
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    Germany.Laudenbach
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    ALTER INDEX REBUILD drops statistics ...

    Oracle 8.1.7.3.50 EE/MVS

    Hi,
    After Rebuilding the Indexes
    the LAST_ANALYZED-Attribute is set to NULL,
    The Statistics for the index is gone.
    Problem is that the CBO goes grazy with indexes when
    no statistics is available ( FULL-TABLE-SCANS ).

    Is there a trick to rebuild the index without dropping the old statistics ( till a new gather of stats ) ?

    Orca

  2. #2
    Join Date
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    Up s**t creek
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    No trick I'm afraid, after you've performed the rebuild you need to re-analyze the index to populate the stats. As far as I'm aware there is no way to retain the old stats.

    Regards
    Jim
    Oracle Certified Professional
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  3. #3
    Join Date
    Jun 2000
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    well you can either export index stats (use dbms_stats.EXPORT_INDEX_STATS) before rebuild then import back (dbms_stats.IMPORT_INDEX_STATS) which takes seconds of time or rebuild with estimate or compute statistics clause

    alter index emp_pk rebuild compute statistics;

  4. #4
    Join Date
    Apr 2002
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    Germany.Laudenbach
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    448
    Originally posted by pando
    well you can either export index stats (use dbms_stats.EXPORT_INDEX_STATS) before rebuild then import back (dbms_stats.IMPORT_INDEX_STATS) which takes seconds of time or rebuild with estimate or compute statistics clause

    alter index emp_pk rebuild compute statistics;
    Thanks pando, this is exactly what i searched
    Orca

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